netdev - Re: [PATCH v2 05/15] cxl: fix use of resource

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Message-ID: <be6dd8bb-d7a2-c19b-f7df-3a8da33fe020@amd.com>
Date: Fri, 16 Aug 2024 15:43:53 +0100
From: Alejandro Lucero Palau <alucerop@....com>
To: fan <nifan.cxl@...il.com>, alejandro.lucero-palau@....com
Cc: linux-cxl@...r.kernel.org, netdev@...r.kernel.org,
 dan.j.williams@...el.com, martin.habets@...inx.com, edward.cree@....com,
 davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
 edumazet@...gle.com, richard.hughes@....com
Subject: Re: [PATCH v2 05/15] cxl: fix use of resource_contains


On 7/24/24 22:25, fan wrote:
> On Mon, Jul 15, 2024 at 06:28:25PM +0100, alejandro.lucero-palau@....com wrote:
>> From: Alejandro Lucero <alucerop@....com>
>>
>> For a resource defined with size zero, resource contains will also
>> return true.
> s/resource contains/resource_contains/
>
> Fan


I'll fix it.

Thanks!


>> Add resource size check before using it.
>>
>> Signed-off-by: Alejandro Lucero <alucerop@....com>
>> ---
>>   drivers/cxl/core/hdm.c | 7 +++++--
>>   1 file changed, 5 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
>> index 3df10517a327..4af9225d4b59 100644
>> --- a/drivers/cxl/core/hdm.c
>> +++ b/drivers/cxl/core/hdm.c
>> @@ -327,10 +327,13 @@ static int __cxl_dpa_reserve(struct cxl_endpoint_decoder *cxled,
>>   	cxled->dpa_res = res;
>>   	cxled->skip = skipped;
>>   
>> -	if (resource_contains(&cxlds->pmem_res, res))
>> +	if ((resource_size(&cxlds->pmem_res)) && (resource_contains(&cxlds->pmem_res, res))) {
>> +		printk("%s: resource_contains CXL_DECODER_PMEM\n", __func__);
>>   		cxled->mode = CXL_DECODER_PMEM;
>> -	else if (resource_contains(&cxlds->ram_res, res))
>> +	} else if ((resource_size(&cxlds->ram_res)) && (resource_contains(&cxlds->ram_res, res))) {
>> +		printk("%s: resource_contains CXL_DECODER_RAM\n", __func__);
>>   		cxled->mode = CXL_DECODER_RAM;
>> +	}
>>   	else {
>>   		dev_warn(dev, "decoder%d.%d: %pr mixed mode not supported\n",
>>   			 port->id, cxled->cxld.id, cxled->dpa_res);
>> -- 
>> 2.17.1
>>